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1、外文资料翻译DesignandImplementationofPLCbasedComputerizedMonitoringinDipCoatingSystemABSTRACTThepresentstudyisaboutthedesignandimplementationofdipcoatingsystembasedonProgrammableLogicController(PLC)technology.ThePLCcorrelatestheoperationparameterscontrolrequiredbytheuserandmonitorsthesystemduringnormalope
2、rationandunderdippingconditions.TestsofdipcoatingsystemdrivenbyDCmotordriverandcontrolledbyPLCproveahigheraccuracyinregulationascomparedtomanualhumanworks.Theimplementationofthehardwareandsoftwareforcontrolsystemandresultsobtainedfromtestsondipcoatingperformanceisprovided.Thus,PLCisprovedasaversatil
3、eandwideeffectivetoolinindustrialcontrolofelectricdrives.GeneralTermsProgrammablelogiccontroller(PLC),PrintedcircuitBoard(PCB),Toggleswitch.KeywordsDipCoating,DCmotor,L293DDriverCircuit,Programmable1.ogiccontroller(PLC),Computer,SlideandVessel1. INTRODUCTIONWiththerapidchangesonindustriesandinformat
4、iontechnologiesinrecentyears,sometraditionalbulkelectronicapplianceshavetobemonitoredforalongtime.AlloftheircontroldevicessuchascommunicationinterfacesgraduallyentertheInternetinformationera.Controlofallequipmentshasbeenperformedthroughtheuseofcomputers.MostequipmentusesPLC(Programmablelogiccontroll
5、er)toconnectwithcomputertomonitorconsumingdevices.PLC,sarewidelyusedinindustrialfieldsbecausetheyareinexpensive,easytoinstallandveryflexibleinapplications.APLCinteractswiththeexternalworldthroughitsinputsandoutputs.Sincetechnologyformotioncontrolofcircuitdrivesbecameavailable,theuseofPLCwithpowerele
6、ctronicsinelectricmachineapplicationshasbeenintroducedinthemanufacturingautomation1.Dipcoatersarerobustcomputercontrolledinstrumentsforprecisethinfilmdeposition.Weprovidesolutionsforthedipcoatingofsmalltolargesamplesineithersingleormultiplevesselswhichissuitableforbothsimpleandcomplexvesselsequencin
7、g2.Sincetechnologyformotioncontrolofelectricdrivesbecameavailable,theuseofPLC,swithpowerelectronicsinelectricmachinesapplicationshasbeenintroducedinthemanufacturingautomation13&4.ManyapplicationsofDCmotorsrequirebesidesthemotorcontrolfunctionality,thehandlingofseveralspecificanaloganddigitalinput/ou
8、tputsignals,homesignals,forwardcommand,reversecommandsandon/off5.Insuchcases,acontrolunitinvolvingaPLCmustbeaddedtothesystemstructure.ThispaperpresentsaPLC-basedmonitoringandcontrolsystemforDipCoating.Itdescribesthedesignandimplementationoftheconfiguredhardwareandsoftware.ThetestresultsobtainedonDCm
9、otorperformanceshowimprovedefficiencyandincreasedaccuracyintimeconstantcontrolledoperation.Thus,thePLCcorrelatesandcontrolstheoperationalparameterstothetimesetpointrequestedbytheuserandmonitorstheDCmotorsystemduringmanualoperationandunderautomaticconditions.2. PLCASASYSTEMCONTROLLERPLCisamicroproces
10、sor-basedcontrolsystem,designedforautomationprocessesinindustrialenvironments.ItusesaprogrammablememoryfortheinternalstorageofUserorientatedinstructionsforimplementingspecificfunctionssuchasarithmetic,counting,logic,sequencing,andtiming6&7.APLCcanbeprogrammedtosense,activateandcontrolindustrialequip
11、ment,incorporatesanumberofI/Opoints,whichallowelectricalsignalstobeinterfaced.InputdevicesandoutputdevicesoftheprocessareconnectedtothePLCandthecontrolprogramisenteredintothePLCmemory(Fig1).Inourapplication,itcontrolsthroughanalog/digitalinputsandoutputsthevaryingload-constantspeedoperationofaninduc
12、tionmotor.Also,thePLCcontinuouslymonitorstheinputsandactivatestheoutputsaccordingtothecontrolprogram.ThisPLCsystemisofmodulartypecomposedofspecifichardwarebuildingblocks(modules),whichplugdirectlyintoaproprietarybus:acentralprocessorunit(CPU),apowersupplyunit,input-outputmodulesI/Oandaprogramtermina
13、l.Suchamodularapproachhastheadvantagethattheinitialconfigurationcanbeexpandedforotherfutureapplicationssuchasmultimachinesystemsorcomputerlinking8.3. CONTROLSYSTEMOFDIPCOATINGMODULEThefollowingconfigurationscanbeobtainedfromthissetup.PLC,sprogrammingisbasedonthelogicdemandsofinputdevicesandtheprogra
14、msimplementedarepredominantlylogicalratherthannumericalcomputationalalgorithms.Theprogrammedoperationsworkonastraighttwo-statettforwardandreverse“basisandthesealternatepossibilitiescorrespondtopositivepolarityornegativepolarity(logicalform)i.e.+12Vor-12vrespectively.In(Fig2),theblockdiagramoftheexpe
15、rimentalsystemisillustrated.Thefollowingconfigurationcanbeobtainedfromthissetup.A. Personalcomputerformonitoringthestatusofdipcoating.B. PLC-programmablelogiccontrollerisprogrammedwithladderdiagramandcommunicateswithPCthroughRS2329.C. AC230V,50HzconverttoDCPowersupply,simultaneouslygives24V-12AMPSfo
16、rPLC,12Vand5V12AMPSforL293ddrivertooperatethefunction(SMPS)10&11.D. CircuitboardcontainsL293DPCB(Printedcircuitboard)designalongwithcontrollerswitchtooperateautoandmanual12&13.E. Dipcoatingmodelhas12,12,*squaresteelsheet,12rod,10angle,2numbersofslideclamperandvesselsclampers.F. TheautomaticprocesscanbecontrolledthesystemofDipcoatingmodulebyAutoandManualsswitchareplacedinbuiltinthecircuitboard.4. HARDWAREDESCRIP
